Amber
Succinite (fossilized tree resin), C10H16O
Organic Gemstone
Category
Mineralized Fossil
Browse mineralized fossil specimens identified by the Rock Identifier community.
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Sandstone
Arenite
sedimentary
Siltstone Concretion
Carbonate-cemented Siltstone Concretion
sedimentary
Fossilized Coral (Petoskey Stone or similar Hexagonaria variant)
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Sandstone / Limestone
Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Concretion
Septarian Concretion (Clay-Ironstone Nodules)
sedimentary
Sandstone with Trace Fossils
Arenite with Ichnofossils
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone Cobble
Arenite (predominantly Quartz Sandstone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (primarily Chalcedony or Quartz, SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Coal
Coal (Combustible sedimentary rock)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Coal (Bituminous / Anthracite)
Carbonaceous Sedimentary Rock (C)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Horn Coral Fossil
Rugosa (Order Rugosa)
sedimentary
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Sandstone
Arenite (SiO2 principal)
sedimentary
Tumbled kambaba jasper (likely)
Kambaba jasper, a silica-rich microcrystalline quartz aggregate, commonly containing fossilized cyanobacterial structures and dark green amphibole/pyroxene minerals
sedimentary
Coal (Bituminous or Anthracite)
Carbonaceous sedimentary rock (primarily Carbon, C)
sedimentary
Silicified Snail Fossil
Gastropod (likely replaced by Chalcedony/Quartz - SiO2)
fossil
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Fossilized Shark Tooth (Fragment) in Matrix
Elasmobranchii (subclass)
fossil
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Polished dendritic jasper or agate slab
Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites
mineral
Limestone
Limestone (CaCO3)
sedimentary
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Fossil Coral
Hexagonaria / Rugose coral (Fossilized calcium carbonate)
fossil
Stromatolite Fossil
Stromatolite (Cyanobacteria biogenic sedimentary structure)
fossil
Coral Fossil
Scleractinia (Class Anthozoa)
fossil
Brachiopod Fossil
Phylum Brachiopoda (poss. Order Spiriferida or Rhynchonellida)
fossil
Gastropod Fossil
Phylum Mollusca, Class Gastropoda
fossil
Brachiopod Fossil
Brachiopoda (Phylum); often Atrypa or Mucrospirifer genus depending on locality
fossil
Coral Fossil
Anthozoa (Scleractinia)
fossil
Calamites fossil
Calamites (extinct genus of arborescent horsetails)
fossil
Fossil Coral
Tabulate Coral (potentially Favosites or Calapoecia)
fossil